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Capillary Electrophoresis-based Hydrogen/Deuterium Exchange for Conformational Characterization of Proteins with Top-down Mass Spectrometry
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Capillary Electrophoresis-based Hydrogen/Deuterium Exchange for Conformational Characterization of Proteins with Top-down Mass Spectrometry

Published on: June 8, 2021

Charge state dependent top-down characterisation using electron transfer dissociation.

Marko Rožman1, Simon J Gaskell

  • 1Ruđer Bošković Institute, HR-10002, Zagreb, Croatia. marko@irb.hr

Rapid Communications in Mass Spectrometry : RCM
|January 7, 2012
PubMed
Summary
This summary is machine-generated.

Optimizing charge states for protein top-down sequencing is crucial. Electron transfer dissociation (ETD) works best for smaller proteins within a specific m/z range, improving characterization efficiency.

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Analytical Chemistry

Background:

  • Top-down sequencing of proteins is essential for comprehensive proteome analysis.
  • Optimizing ion charge states is critical for maximizing sequence coverage and data quality.
  • Limitations in instrument performance can affect the analysis of larger proteins and fragments.

Purpose of the Study:

  • To determine the optimal charge state range for top-down sequencing of proteins (5-30 kDa).
  • To evaluate the impact of charge state modification on protein ion dissociation.
  • To provide guidance for selecting charge states in combined Electron Transfer Dissociation (ETD) and Collision-Induced Dissociation (CID) strategies.

Main Methods:

  • Proteins were generated under denaturing conditions.
  • Charge states were modified using ion/ion proton transfer reactions.
  • Electron Transfer Dissociation (ETD) and Collision-Induced Dissociation (CID) were employed for ion dissociation.

Main Results:

  • Optimal sequence coverage for ETD was observed for charge states in the m/z range of 700-950.
  • Sequence coverage decreased for precursor m/z above 1000 and was dependent on protein size (smaller proteins yielded better coverage).
  • Combined ETD/CID analysis presented challenges in defining a single optimal m/z range due to differing optimal conditions for each method.

Conclusions:

  • A starting m/z range around 950 is suggested for combined ETD/CID when only one charge state can be analyzed.
  • Analyzing two distinct charge states, one optimized for ETD and another for CID, is recommended for comprehensive analysis.
  • These findings aid in achieving enhanced characterization of smaller proteins or large protein fragments efficiently.